SkPDF: alloc less memory for strings

src/pdf/SkPDFUtils.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkPDFUtils_DEFINED
 #define SkPDFUtils_DEFINED
@@ skipping 48 matching lines @@
     static void ApplyPattern(int objectIndex, SkWStream* content);
 
     // 3 = '-', '.', and '\0' characters.
     // 9 = number of significant digits
     // abs(FLT_MIN_10_EXP) = number of zeros in FLT_MIN
     static const size_t kMaximumFloatDecimalLength = 3 + 9 - FLT_MIN_10_EXP;
     // FloatToDecimal is exposed for unit tests.
     static size_t FloatToDecimal(float value,
                                  char output[kMaximumFloatDecimalLength]);
     static void AppendScalar(SkScalar value, SkWStream* stream);
-    static SkString FormatString(const char* input, size_t len);
+    static void WriteString(SkWStream* wStream, const char* input, size_t len);
 };
 
 #endif